Function repeatVector

Repeats the input n times in a new dimension.

 const model = tf.sequential();
 model.add(tf.layers.repeatVector({n: 4, inputShape: [2]}));
 const x = tf.tensor2d([[10, 20]]);
 // Use the model to do inference on a data point the model hasn't seen
 model.predict(x).print();
 // output shape is now [batch, 2, 4]
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